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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2017
Fair Value [Abstract] |
Carrying Values and Fair Values of Debt Instruments | The carrying values and fair values of the Company’s debt instruments where the carrying values do not approximate their fair values as of March 31, 2017 and December 31, 2016, are as follows:
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Carrying Value at |  | Fair Value* at
﻿ |  | March 31, 2017 |  | December 31, 2016 |  | March 31, 2017 |  | December 31, 2016
﻿4.00% Senior Notes due 2018 |  | $ | 50,000 |  | $ | 50,000 |  | $ | 51,028 |  | $ | 51,226
﻿5.25% Senior Notes due 2019 |  | $ | 175,000 |  | $ | 175,000 |  | $ | 187,775 |  | $ | 187,671
﻿4.64% Senior Notes due 2021 |  | $ | 100,000 |  | $ | 100,000 |  | $ | 107,440 |  | $ | 106,618
﻿2.39% Senior Notes due 2021 |  | $ | 150,000 |  | $ | 150,000 |  | $ | 148,163 |  | $ | 146,168
﻿3.09% Senior Notes due 2022 |  | $ | 125,000 |  | $ | 125,000 |  | $ | 126,024 |  | $ | 123,974
﻿2.75% Senior Notes due 2023 |  | $ | 200,000 |  | $ | 200,000 |  | $ | 196,267 |  | $ | 192,238
﻿3.41% Senior Notes due 2025 |  | $ | 375,000 |  | $ | 375,000 |  | $ | 378,202 |  | $ | 368,968
﻿3.03% Senior Notes due 2026 |  | $ | 400,000 |  | $ | 400,000 |  | $ | 390,132 |  | $ | 379,438
______________________ *Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value is based on quotes of bonds with similar ratings in similar industries.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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